Sorry to hear you are having trouble. I am not 100% sure, but I think the 38A has a different slide system than the one shown in the video. If you are planning to attempt this repair by yourself maybe you could call FR back and see if they can at least help you to get the right parts before you spend money on parts that may not fit.
The parts guy at FR someone once told me about is: Andy Thompson 574-522-1747
I don't know if he is the exact person that can help you, but I am sure if he isn't he can help you find the person that can help you.
Good Luck and please keep us posted.